Home » Public Forums » GMCnet » Help!! (Generator)
| Help!! [message #250923] |
Thu, 29 May 2014 17:20  |
Mitch
Messages: 272
Registered: May 2009
Location: Tacoma, Wa
Karma: 0
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Onan spins but only sputters, won't start.
Changed plugs. Still no go.
Ideas?
Mitch
Tacoma, Wa.
'80 Spitfire
'03 Windstar
'77 Jaguar XJ6-C
X(very)'76 PB 26 "The Beast"
Where it rains, always.
It's wet, No sun, Gray.
Go to Oregon.
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| Re: [GMCnet] Help!! [message #250924 is a reply to message #250923] |
Thu, 29 May 2014 17:28  |
powerjon
Messages: 2446
Registered: January 2004
Karma: 5
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Also check the points and condenser too.
JR Wright
78 Buskirk Stretch
75 Avion
Michigan
On May 29, 2014, at 6:20 PM, Mitch wrote:
> Onan spins but only sputters, won't start.
> Changed plugs. Still no go.
> Ideas?
>
> --
> Mitch
> Tacoma, Wa.
> '80 Spitfire
> '03 Windstar
> X(very)'76 PB 26 "The Beast"
> Where it rains, always.
>
> It's wet, No sun, Gray.
> Go to Oregon.
> _______________________________________________
> GMCnet mailing list
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J.R. Wright
GMC GreatLaker
GMC Eastern States
GMCMI
78 30' Buskirk Stretch
75 Avion Under Reconstruction
Michigan
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| Re: [GMCnet] Help!! [message #250929 is a reply to message #250924] |
Thu, 29 May 2014 17:52 |
Olly Schmidt
Messages: 1265
Registered: February 2014
Location: Germany and Scottsville, ...
Karma: 8
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John Wright,
> Also check the points and condenser too.
>
How do we check the condenser?
--
Best regards
Peer Oliver Schmidt
the internet company
PGP Key ID: 0x83E1C2EA
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Best regards
Olly Schmidt
PGP Key ID: 0x18a9 3a1f 4196 bf22
'76a Eleganza II, VA
'73 Sequoia, SH, Germany
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| Re: [GMCnet] Help!! Onan not starting [message #250933 is a reply to message #250929] |
Thu, 29 May 2014 18:15 |
Olly Schmidt
Messages: 1265
Registered: February 2014
Location: Germany and Scottsville, ...
Karma: 8
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We checked spark, and receive some
We checked fuel filter, it looks clean
We removed air filter.
Still no go. Any other suggestions?
--
Best regards
Peer Oliver Schmidt
the internet company
PGP Key ID: 0x83E1C2EA
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Best regards
Olly Schmidt
PGP Key ID: 0x18a9 3a1f 4196 bf22
'76a Eleganza II, VA
'73 Sequoia, SH, Germany
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| Re: [GMCnet] Help!! Onan not starting [message #250935 is a reply to message #250934] |
Thu, 29 May 2014 18:24 |
Olly Schmidt
Messages: 1265
Registered: February 2014
Location: Germany and Scottsville, ...
Karma: 8
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Larry Davick,
> I believe someone noted long ago that the Onan won't run without the air filter. Am I hallucinating?
>
Air filter is back on. No idea how good/bad it is.
--
Best regards
Peer Oliver Schmidt
the internet company
PGP Key ID: 0x83E1C2EA
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Best regards
Olly Schmidt
PGP Key ID: 0x18a9 3a1f 4196 bf22
'76a Eleganza II, VA
'73 Sequoia, SH, Germany
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| Re: [GMCnet] Help!! Onan not starting [message #250944 is a reply to message #250933] |
Thu, 29 May 2014 20:04 |
Joe Weir
Messages: 769
Registered: February 2013
Location: Columbia, SC
Karma: 7
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Peer,
You have air and spark. Is the fuel pump pumping? Is there fuel in the carb? Good fuel? How long has it been since it was started?
I know I have a tendency to skip over the basics to find a short cut to the solution. Often the fix was one of the steps skipped.
Peer Oliver Schmidt wrote on Thu, 29 May 2014 18:15We checked spark, and receive some
We checked fuel filter, it looks clean
We removed air filter.
Still no go. Any other suggestions?
--
Best regards
Peer Oliver Schmidt
the internet company
PGP Key ID: 0x83E1C2EA
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76 Birchaven - "Wicked Mistress" - New engine, trans, alum radiator, brakes, Sully airbags, fuel lines, seats, adult beverage center... those Coachmen guys were really thinking about us second hand owners by including that beverage center...
Columbia, SC.
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| Re: [GMCnet] Help!! Onan not starting [message #250946 is a reply to message #250944] |
Thu, 29 May 2014 20:07 |
sgltrac
Messages: 2797
Registered: April 2011
Karma: 1
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Spray starting fluid on air filter while cranking. If you have spark it will run. Then chase the fuel.
Todd Sullivan
Sully
77 royale
Seattle
> On May 29, 2014, at 6:04 PM, Joe Weir wrote:
>
> Peer,
>
> You have air and spark. Is the fuel pump pumping? Is there fuel in the carb? Good fuel? How long has it been since it was started?
>
> I know I have a tendency to skip over the basics to find a short cut to the solution. Often the fix was one of the steps skipped.
>
>
> Peer Oliver Schmidt wrote on Thu, 29 May 2014 18:15
>> We checked spark, and receive some
>> We checked fuel filter, it looks clean
>> We removed air filter.
>>
>> Still no go. Any other suggestions?
>>
>> --
>> Best regards
>>
>> Peer Oliver Schmidt
>> the internet company
>> PGP Key ID: 0x83E1C2EA
>>
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
>
> --
> 76 Birchaven - New engine, trans, brakes, airbags, fuel lines, seats, upholstery, adult beverage center... those Coachmen guys were really thinking
> about us second hand owners...
> Columbia, SC.
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
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Sully
77 Royale basket case.
Future motorhome land speed record holder(bucket list)
Seattle, Wa.
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| Re: [GMCnet] Help!! Onan not starting [message #250948 is a reply to message #250946] |
Thu, 29 May 2014 20:23 |
Otterwan
Messages: 946
Registered: July 2013
Location: Lynnwood (north of Seattl...
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Does it try to start as long as you hold the switch and blow a bunch of smoke out the exhaust? Bad control board. Jump pins 5 and 9 (a test lead with alligator clips works great). You can also jump 9 to 11, which does the same thing but bypasses the fuse as well. The fuel pump should start to run immediately. Press the start switch. If it starts, your control board is bad. You may have to remove the jumper to stop the Onan.
FYI if you have been trying to start it for some time your spark plugs are likely fouled. Check and clean them.
Here's picture of the board showing the pin numbers. 5 is at the upper left, 11 and 9 on the right.
http://www.dinosaurelectronics.com/images/O_300_1073_wh.jpg
1977 Birchaven, Lynnwood WA - "We may not be able to stop all evil in the world, but I know that how we treat one another is entirely up to us."
[Updated on: Thu, 29 May 2014 20:34] Report message to a moderator |
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| Re: [GMCnet] Help!! Onan not starting [message #250953 is a reply to message #250948] |
Thu, 29 May 2014 21:29 |
Olly Schmidt
Messages: 1265
Registered: February 2014
Location: Germany and Scottsville, ...
Karma: 8
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Senior Member |
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We are so sorry to have caused that much trouble.
The problem was, the Onan folks were clever. They said, let's put
another sensor in there. One that checks oil level... do I need to say
more *blush*
--
Best regards
Peer Oliver Schmidt
the internet company
PGP Key ID: 0x83E1C2EA
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Best regards
Olly Schmidt
PGP Key ID: 0x18a9 3a1f 4196 bf22
'76a Eleganza II, VA
'73 Sequoia, SH, Germany
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| Re: [GMCnet] Help!! Onan not starting [message #250968 is a reply to message #250954] |
Thu, 29 May 2014 22:56 |
Mitch
Messages: 272
Registered: May 2009
Location: Tacoma, Wa
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It's tired, and I'm late, but this seems to have come down to the oil pressure switch. The engine starts when I jumper 5-9 - doesn't since I put the cover back on.
two questions:
Where - precisely is the oil pressure switch and is it a common item at parts stores.
Second, and shame on me for this,I drew an arc as i was putting in the lower left mounting bolt: how much damage did I do there?
Also (Yeah, I know I said two) could the circuit board be bad, and how do I check for that?
Mitch
Tacoma, Wa.
'80 Spitfire
'03 Windstar
'77 Jaguar XJ6-C
X(very)'76 PB 26 "The Beast"
Where it rains, always.
It's wet, No sun, Gray.
Go to Oregon.
[Updated on: Thu, 29 May 2014 22:56] Report message to a moderator |
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| Re: [GMCnet] Help!! Onan not starting [message #250978 is a reply to message #250968] |
Fri, 30 May 2014 00:10 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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Senior Member |
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Mitch,
If you want to prove it is the switch, simply unplug the switch. It works by grounding the circuit when the pressure is too low. So by unplugging the switch it will always send that there is oil pressure all the time.
The switch is located near the base of the oil filter. Standing in front of the generator remove the right cover that has the oil filter through the hole in it. Look at the bottom of the filter and you should see the switch screwed in and one wire going to it.
If you want to unplug the switch without removing the cover simply remove the wire plugged in to the board on pin #12.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: [GMCnet] Help!! Onan not starting [message #250985 is a reply to message #250968] |
Fri, 30 May 2014 01:08 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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Senior Member |
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Mitch wrote on Thu, 29 May 2014 22:56It's tired, and I'm late, but this seems to have come down to the oil pressure switch. The engine starts when I jumper 5-9 - doesn't since I put the cover back on.
two questions:
Where - precisely is the oil pressure switch and is it a common item at parts stores.
Second, and shame on me for this,I drew an arc as i was putting in the lower left mounting bolt: how much damage did I do there?
Also (Yeah, I know I said two) could the circuit board be bad, and how do I check for that?
The switch is available at AZ, Rock Auto, and Advanced. I believe it is Wells PS117. PS117 is 3 to 5 PSI, Normally Closed, but check the threads and electrical connector closely with the old one to be sure it is the same thing. If you have the GMCMI parts list you might look there. Mine is 11 miles away in my coach. I wish I had the list electronically and could store it on my PC, but GMCMI does not want to give it to us.
As far a the electrical short goes, it is impossible for me to remotely guess what, if anything, might have been damaged. I would pull the cover off again and at least check to see if the 5 Amp fuse is blown. Then try the board again to see if it is working correctly with the oil switch disconnected. Jumpering 5 to 9 proves that the generator is running correctly and that the control board is keeping it from running. It might be the board but it also could and input to the board that is bad. So do not just throw a new board at it.
I know he has a time schedule to keep to and needs to get on the road. I do not know his schedule but if he wants to reroute by my place I could have Jim K. send me a board for Monday afternoon delivery and we could troubleshoot the problem after Monday afternoon mail delivery here in NW Indiana. Also Tom Hampton is on his way and probably has the board in stock. Tom is in Marysville, OH just off of I-70. Call first to verify this.
Feel free to telephone me if you think I can help. My number is on the Black list.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
[Updated on: Fri, 30 May 2014 01:18] Report message to a moderator |
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| Re: [GMCnet] Help!! Onan not starting [message #250987 is a reply to message #250985] |
Fri, 30 May 2014 02:50 |
midlf
Messages: 2212
Registered: July 2007
Location: SE Wisc. (Palmyra)
Karma: 1
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Ken Burton wrote on Fri, 30 May 2014 01:08
The switch is available at AZ, Rock Auto, and Advanced. I believe it is Wells PS117. PS117 is 3 to 5 PSI, Normally Closed, but check the threads and electrical connector closely with the old one to be sure it is the same thing. If you have the GMCMI parts list you might look there. Mine is 11 miles away in my coach.
From the parts list: AZ PS117, NAPA OP6282, OP6075, OP6074, Car Quest PF120, Borg Warner S310.
Steve Southworth
1974 Glacier TZE064V100150 (for workin on)
1975 Transmode TZE365V100394 (parts & spares)
Palmyra WI
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